Independent prediction of slip velocity and hold-up in liquid/liquid extraction columns

TLDR: The correlation of slip velocity using a large bank of published data for pulsed perforated plate, Karr reciprocating-plate, rotating disc and spray extraction columns is presented in this article.

Abstract: The correlation of slip velocity using a large bank of published data for pulsed perforated-plate, Karr reciprocating-plate, rotating disc and spray extraction columns is presented. Based on more than 3,700 data points with and without mass transfer, empirical equations not including hold-up for each of the columns are suggested which reproduce the slip velocity data over a wide range of variables. Explicit correlations for hold-up in both the loose and dense-packed regions of operation in spray columns are also presented which do not involve slip velocity. The equations presented are more exact and simpler to use than previous empirical correlations; these often involve the characteristic velocity which is difficult to accurately predict.